Interstate 10: route guide

I-10 runs west–east across the southern tier of the United States. It starts at the Pacific Coast in Santa Monica, California, where it meets CA-1 (Pacific Coast Highway), and ends in Jacksonville, Florida, at its junction with I-95. To reach the Atlantic itself, continue about 20 mi east on US-90 (Beach Blvd) to FL-A1A in Jacksonville Beach.

The corridor links Los Angeles, Phoenix, Tucson, Las Cruces, El Paso, San Antonio, Houston, New Orleans, Gulfport–Biloxi, Mobile, Pensacola, Tallahassee and Jacksonville. It passes through three state capitals: Phoenix (Arizona), Baton Rouge (Louisiana) and Tallahassee (Florida).

It is the third-longest transcontinental interstate, behind I-90 and I-80, and the fourth-longest east–west interstate after I-40. It crosses I-5, I-8, I-15, I-17, I-25, I-20, I-35, I-45, I-49, I-55, I-59, I-65, I-75 and I-95, so you can join or leave the route almost anywhere.

Treat I-10 as five or six separate trips rather than one. The California–Arizona leg is the most varied: Santa Monica and Los Angeles at the coast, then desert, the Coachella Valley and Phoenix. Tucson is worth an overnight for Saguaro National Park and the Arizona-Sonora Desert Museum.

The Texas leg is the longest and the one most people underestimate. El Paso to San Antonio is roughly 550 mi with long empty stretches and few towns; fuel and water before you leave El Paso. San Antonio, Austin (a detour north on I-35) and Houston break the state up. The only tolled part of I-10 is the Katy Managed Lanes, about 13 mi of inner lanes west of Houston between I-610 and TX-6; the outer lanes stay free.

East of Houston the character changes. New Orleans, then the Mississippi Gulf Coast at Gulfport and Biloxi, then Mobile, Pensacola and the Florida Panhandle. Tallahassee to Jacksonville is a straight, fast run to the Atlantic.

October to April is the comfortable window. Summer across the Southwest is punishing: desert temperatures routinely pass 40 °C, and the El Paso–San Antonio stretch has little shade and long gaps between services. Spring brings wind and dust in West Texas and New Mexico.

The Gulf Coast has its own calendar. Hurricane season runs June to November, with the highest risk from August to October; check forecasts before committing to the Louisiana, Mississippi, Alabama and Florida sections in that period. Winter is mild along the whole southern route, which is why snowbirds use it.

Book around the cities, not the interstate. Chain motels cluster at most exits, but the better-value and more interesting stays are in the city centres or just outside them: Tucson, San Antonio, New Orleans, Mobile and Pensacola all have walkable districts within a short drive of I-10.

For a fast crossing, plan overnight stops roughly 400–500 mi apart: Phoenix or Tucson, El Paso, San Antonio, Houston, New Orleans, Mobile or Pensacola, then Jacksonville. In New Orleans, expect higher prices and minimum stays around Mardi Gras and major festivals; book well ahead.

Camping and RV parks are common in Arizona, New Mexico and West Texas, and along the Florida Panhandle coast. In summer, desert campgrounds are best avoided at low elevation.

This is a long drive through warm, sometimes empty country. Carry more water than you think you need, especially between El Paso and San Antonio and across the Mojave-adjacent sections of California. Fuel up at half a tank rather than a quarter in West Texas and New Mexico.

Wildlife and snakes are a real hazard in the warmer states. Rattlesnakes and cottonmouths are found in shade, under vegetation, under parked vehicles and occasionally inside restroom buildings at rest stops; warning signs are posted at many rest areas, campgrounds and trails. Shake out shoes and look before you reach.

Check your vehicle before leaving: tyres, coolant, spare and air conditioning. Summer breakdowns in the desert are the main risk on this route. Most of I-10 is toll-free, so you do not need a transponder except for the Katy Managed Lanes near Houston.